//AJAX aanzetten in verschillende browsers
function ajaxFunction()
{
    var ajaxRequest = null; 
   
    try
    {
        // Opera 8.0+, Firefox, Safari
        ajaxRequest = new XMLHttpRequest();
    }
    catch (e)
    {
        // Internet Explorer
        try
        {
            ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
        }
   
    catch (e)
    {
        //overige
        try
        {
            ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
   
    catch (e)
    {
                // er ging iets mis
                alert("Uw browser heeft ondersteuning van AJAX afgewezen.");
                return false;
    }
   
  }
} 
  
   
   
// Functie die de div weer volschrijft met de nieuwe info
ajaxRequest.onreadystatechange = function()
{
    if(ajaxRequest.readyState == 4)
    {
        document.getElementById('berichten').innerHTML = ajaxRequest.responseText;        
    }
}
    var naam = document.getElementById('naam').value;
    var email = document.getElementById('email').value;
    var bericht = document.getElementById('bericht').value;
    var code = document.getElementById('security_code').value;
    var queryString = "?naam=" + naam + "&email=" + email + "&bericht=" + bericht + "&code=" + code;

    document.getElementById('naam').value = "";
    document.getElementById('email').value = "";
    document.getElementById('bericht').value = "";
    document.getElementById('security_code').value = "";
    document.getElementById("berichten").innerHTML = ajaxRequest.open("GET", "bericht_plaatsen.php" + queryString, true);
    document.getElementById("captcha").innerHTML = "<img name='captcha' id='captcha' src='CaptchaSecurityImages.php?width=150&height=50&characters=5 + Math.Random()' alt='Captcha' /><br /><input id='security_code' name='security_code' type='text' /><br />";
    ajaxRequest.send(null);
}